Posted By

RobertHegeraad on 01/14/12

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Last Edited at 01/14/12 12:17am

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Easy to implement and adjust Poll Class

/ Published in: PHP

Very simple to use Web Poll Class, simply create a new instance, set the question and set the answers. You still have to set up your database yourself

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<?php
/*
 * Requires database(web-poll) with a table(poll) with two fields, votes(int) and language(varchar)
 */
class Vote
{
    public $question;
    public $answers = array();
    private $_db;

public function __construct($question)
    {
        //Set the question
        $this->question = $question;

//Connect to the database
        try
        {
            $this->_db = new PDO('mysql:host=localhost;dbname=web-poll', 'root', '');
        }
        catch(PDOException $e)
        {
            echo $e->getMessage();
        }
    }
    
    //Insert the users vote and update the vote count
    public function insertVote($vote)
    {
        $stmt = $this->_db->prepare("UPDATE poll SET votes = votes + 1 WHERE language = ?");
        $stmt->execute(array($vote));
    }

//Set the answers
    public function setAnswers($answer)
    {
        $this->answers[] = $answer;
    }
    
    //Display the vote field
    public function displayVote()
    {
        echo '<div class="poll">
                  <p>'.$this->question.'</p>
                  <form action="index.php" method="POST">
             ';

foreach($this->answers as $answer)
        {
            echo '<p><input name="vote" type="radio" value="'.$answer.'" /> '.$answer.'</p>';
        }

echo '    <input type="submit" value="Vote" />
                  <a href="index.php?results=show"><input type="button" value="Show results" /></a>
                  </form>
              </div>
             ';
    }
    
    private function totalVotes($answers)
    {
        //Select the votes from the database for every answer
        foreach($answers as $answer)
        {
            try
            {
                $stmt = $this->_db->prepare("SELECT votes FROM poll WHERE language = ?");
                $stmt->execute(array($answer));
                $getvotes[] = $stmt->fetch(PDO::FETCH_ASSOC);
            }
            catch(PDOException $e)
            {
                echo $e->getMessage();
            }
        }

//Add the all the votes together
        for($i=0; $i < count($getvotes); $i++)
        {
            $totalvotes += $getvotes[$i][votes];
        }

return $totalvotes;
    }

//Display the vote results
    public function displayResults()
    {
        //Get the total amount of votes
        $totalvotes = $this->totalVotes($this->answers);

//Get the results
        $stmt = $this->_db->prepare("SELECT * FROM poll");
        $stmt->execute();

echo '<div class="poll">';

while($results = $stmt->fetch())
        {
            //calculate the percentage   //replace 45 with total votes
            $percent = floor(100 / $totalvotes * $results['votes']);

echo '<div class="section">
                      '.$results['language'].': '.$percent.'% with '.$results['votes'].' votes
                      <div class="bar" style="width:'.$percent.'%;"></div>
                  </div>
                 ';
        }

echo '</div>';
    }
}

<?php

//To set up and use the Vote Class

require_once('Vote.class.php');

//Create a new instance and set a question
$vote = new Vote('What is your favorite scripting language?');

//Set the answers
$vote->setAnswers('PHP');
$vote->setAnswers('JAVA');
$vote->setAnswers('PERL');
$vote->setAnswers('HTML');

//If a user has voted
if(isset($_POST['vote']))
{
    $vote->insertVote($_POST['vote']);
    $vote->displayResults();
}
//If the user has clicked the Show Results button
else if(isset($_GET['results']))
{
    $vote->displayResults();
}
else
{
    $vote->displayVote();
}

The CSS i used.

.poll {
    width:200px;
    padding:10px;
    font-size:15px;
    background:#F9F9F9;
    outline:1px solid #DFDFDF;
    border:1px solid #ffffff;
}
.poll .section {
    margin-top:10px;
}
.poll .bar {
    height:10px;
    background:#FA4343;   /* Fallback IE, Opera */
    background:-moz-linear-gradient(top, #FA4343, #D91111);   /* Mozilla: */
    background:-webkit-gradient(linear, left top, left bottom, from(#FA4343), to(#D91111));   /* Chrome, Safari:*/
    border:1px #D91111 solid;
}

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